Armature for electric machines



(-No Model.) V 2 Sheets-Sheet 1.

R. M. GARDNER. ARMATURE FOR BLEGTRIG MACHINES.

No. 553,557. Patented Jan. 28, 1896.

(No Model.) 2 Shee1;s----Sheetv 2.

R. M. GARDNER.

ARMATURE FOR ELECTRIC MAGHINES.

No. 553,557. Patented Jan. 28,1896.

UNITED STATES PATENT OFFICE.

RICHARD MORGAN GARDNER, OF CHICAGO, ILLINOIS.

ARMATURE FOR ELECTRIC MACHINES.

SPECIFICATION forming part of Letters Patent No. 553,557, dated January28, 1896.

Application filed May 2 7, l 8 9 5 T 0 aZZ whom it may concern:

Be it known that I, RICHARD MORGAN GARDNER, a citizen of the UnitedStates of America, residing at Chicago, in the county of Cook and Stateof Illinois, have invented certain new and useful Improvements inArmatures for Electric Machines, of which the following is aspecification.

My invention relates to armatures for electric machines; and the purposeof the inven tion is to avoid possibility of the breaking of the wireswhich connect the commutator-segments with the armature-coils.

The invention is particularly valuable in motors which are subject to agreat deal of jarring or j oltingas, for instance, those used uponmining machinery, cars, and the like.

The invention is illustrated in the drawings by means of six figures, ofwhich Figure 1 is an end elevation of an armature. Fig. 2 is an axialsection. Fig. 3 is a broken side elevation. Fig. lis an end elevation ona larger scale of a portion of the armature with certain parts removed.Fig. 5 is a portion of an axial section upon a similar scale, and Fig. 6is an end elevation of one of the commutator-segments.

The armature core and frame may be of any desired construction. Alaminated core is shown at A and the plates of the same are heldtogether by rings B B. A thirdring, C, of insulating material-as, forinstance, fiberis secured to the plate B by means of screws 0, and saidinsulating-plate is preferably formed, as shown in Fig. A, to the bestadvantage where the L-shaped grooves c are separated by the ridges 0 Thegrooves are intended to receive the windings and the shorter arm, whichis marked 0 to permit the inner end of each winding to be turned atright angles, so that said end may be within reach. This is shown inFig. at at as, where the inner end of an insulated copper ribbon D isshown as turned at right angles and having its end d bared to expose thecopper. The ridges 0 help to space the windings apart. In the samefigure the outer end of one of the windings or coils is seen at cl, andsaid end is also bared to expose the conducting material.

The commutator is composed of a number Serial No. 550,737. (No model.)

of segments E, one of which is shown inFig. 6, and which are properlyinsulated from each other and held in a suitable clamping device F. Eachsegment has a projecting arm e, which reaches to the coils and isprovided at its outer end with two tongues e 6 the former of whichextends laterally from the arm and rests upon the outer end of one coiland the latter of which extends in between the coils and rests upon theinner end of the adjacent coil. This is clearly shown in Figs. 1 and 3.Each arm is provided with a screw a (see Figs. 1 and'2,) by means ofwhich said arm may be clamped securely upon the ends of the coils. Insome cases these screws may be unnecessary, as it is obvious that theentire commutator may be moved toward or away from the coils to get thedesired pressure, and the length of the arm 6 is sufficient to give allthe elasticity necessary to insure a perfect contact of every arm. Inthis way I dispense entirely with any connections other than thatfurnished by the commutator itself between the armature coils, and thereis therefore no opportunity for any breaking of such connection byjarring or other means.

I claim as new and desire to secure by Letters Patent- 1. Thecombination in an armature of the class described, of a series of coils,each of which has its inner end turned laterally to project from beneaththe coil and both this projection and its outer end freed from theinsulation, and a series of commutator segments, each of which has aprojecting arm, a portion of which extends to and is tightly clampedupon the inner end of one coil and 'another portion extends to and istightly clamped upon the outer end of the adjacent coil; substantiallyas described.

2. The combination in an armature of the class described, of a series ofcoils having their inner ends turned laterally in the same direction andbared at the end and their outer ends also freed from insulation and aseries of commutator segments, E, having radially projecting arms, 6,provided with the lips, 6, e the former of which all project laterallyin the same direction and rest upon the outer ends of the respectivecoils and the latter of which project inwardly between the arms, a, andtongues, 6, (2 the tongues, c, coils and rest upon the inner ends of thenext resting upon the bared outer ends of the readjacent coils;substantially as described. spective coils and the tongues, 0' restingThe combination in an armature of the upon the bared inner ends of theadjacent 5 class described, of the insulating ring, 0, haw coils;substantially as described.

in the reeves, c, and intervenin rid es, l i 7 ,T i Y j c fthe cbils, D,Wound in the gro ves 311a RIQHARD MORGA) GARDAL] having their inner endsturned laterally to itnesses: project from beneath. the coils and thecom- CHAS. O. SHERVEY, 1o mutator segments E, having the projecting A.I. ll. EBBESEN.

